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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509ad7e6583716199eba1d7da2116d1ca196f695cc08f248c6655737e7368c80' 
  AND token = 'WzEz6P3UZN6arMora/nWOYESMbRA7AmR3dTKfMW5WwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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