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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da3f104069af65fb9723f61a76d52aaea76e5f44605c14a4b37b82b63f5181a' 
  AND token = 'Kn681/qAsWtMhnvYMPmW+qJf5OpYWrX+bNigl3i4z3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}