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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ce462b157df7c587f787533d58374d7abcb0ff08218f177893605fd0e2db9f' 
  AND token = 'r34kbBkhiCI+0s90NmUqY7Tx/0/Cxm/3At4HZw+1f94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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