SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c4f706b09daa46826a2a85ab65b3c11e5c3e36fcf34509c37d57dd69136b5e' 
  AND token = 'G3r9TKq4YwIGxz1QXbhwFtTE5wzI2Z02DzJBrYliFLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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