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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ef05eec2d38833ee677fdbf661d9014791fa2f05019de02bf8b8dd93fcf949' 
  AND token = '9j9ndygaJxGznjrG6No8QU4qobJQZdwnvNKvZzKIm3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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