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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f41bb8c8503c47548ed7628c47083eb715433cc4ed810ba5b2c08775522eda23' 
  AND token = 'nRF4aRwOEsELvIix+du6l2eIRhCkUol8+vyTquZ+O+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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