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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79b08904564fc84183b7d016ccafcb644d25fe83c5050420073470404580a62' 
  AND token = 'mIPTtO8yDUX4ODh1b+f1Y87Y39n/NR9nViA1tfc1U28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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