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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '356799c57bca2b7f5303f75bbdd1950a69f1052e32434eb964cb31642627acda' 
  AND token = 'f6006m9WJqvlAlI++aonMxjB1KdoJa8Kimem8ynFRa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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