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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f99e10d2dfdd0b3214a249eea38d766684db1ef88170c61c1c683a6ab08fdef' 
  AND token = 'gmtGbEGAImbczoZT7OESbje/sXWlKQOChL/owChJ4Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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