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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3424f962af6d328333fc6d98e65aed228ee0b2b1fccc2cfbb6bd21a0b6f043c8' 
  AND token = 'kF4Uds20gH8R5/ozCuob2q5p38H0/UU0UwA8JtKPS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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