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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fc42b18e19f8c25e9a3a9f1ae97cafa324ea81de842987175956310fe32f4c' 
  AND token = 'z9Od0r2xnG5hJYXOpYmqjxIgLE8fuVpeDIYRCzl3JW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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