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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0deff7740f198bea793c06dc7675f48e952eb4dc61f9bf8c88b2bc3872bef7d2' 
  AND token = 'Iiz+FK9+cTRJti6Og7Ug8Q+GjH4rhCAmWJcjgsgFuco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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