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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32934d451a3542f4140f5551125763599680809c29100b456f972c8b21b81140' 
  AND token = 'M0eIxiKjsJh/tyG0Xg5TCmPhBQ6vWQfygkXX45SUTCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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