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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84789ecd205585071a053df632bf84994dacccd7c6094ce5fc004094eda0edd9' 
  AND token = 'uRz6N2MObsUQokA/d6By2ouGe6/3yoZuxcmQ+fb57f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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