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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313a664d29410129f659542f21bab1a6fe8e58ffaede79ffb20450bb29631710' 
  AND token = '1vHlmAun97xY4cWZyuf3CRYAt8mXaRH0CciukkrBhWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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