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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3580cc4b8beafd76f628393c3195c0ae825506ed5c1ddfa7b70f7c9dfdcf7de6' 
  AND token = 'gdbwT/FQYbsa2umk5lQAYiuNrJ+nsPLSLgJBMI3dy48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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