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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a897ae80fe695cfaafa3eab299c249386b6a402b30dad5e9aef6d7a9faccd1' 
  AND token = 'g2uJJdWyRTmqZzF1S0Q2N5Lz7xw4bUnD5GE8Rwi7G20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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