SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '076091335da5bd4657757a4cec2297b205302525fd2ca52c907d2d4c9af0051b' 
  AND token = 'HjaVS1UYOqiDUHulhO/i78gqZIsQrfhGF0HqDP/oTJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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