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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8d52b8ae1e5e65be4c4bcf5cd945f4752cd78daaec3d8cc9d7c45ccf33314f' 
  AND token = 'Ap4Ml82wIzBQwxaQAaGnZl92fHlNyAw0/fmtBS9PNRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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