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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6999994ed3a4cad8e50c860c999ed532aba791ca316459e71ac65668f2526ba7' 
  AND token = '46R4qFJzFSlIoPEWZLQtoTgwyUA/TqLds1AnMs6QQzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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