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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9255e30e37c23aa9f7926b2c4046be7f1f34a35b0979c528b4d222976fff8c42' 
  AND token = '9e5hL0tltMBriSW2K1G+tP95wrD6mykQZJu3IZpTk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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