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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab28d65fef730263358bd89c6f1a5b67a0bcef0712d5670e6d580ac27cc3cfcd' 
  AND token = 'f96ZVliUq4ZcJIzkOHIvvnPXGoqRzwzmy0b7qIlJVPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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