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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae77ff05cc6b2413b84f7025efaf42bb59e79ab2d0bffd7aefe4d629bff3ace' 
  AND token = 'iDCMJYyARCY0yclHYVxi7sx15VrG4C6650ZRbgixPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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