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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f138769731367ad88f8d9b6c6958319a6ce5f05f3951790c648cb8202126dad' 
  AND token = '0AzNxOHq4vay7FT9DMbKKoRJJSoqNs0UV3U4kRtLBco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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