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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae62ff6fdd95e84c8111b6dc0d217a1543e4b484c61fcfcd743971b1c531a7f' 
  AND token = '64txPpGmmuqdNFUyyaQ5TGI5C+yzvCBGzOLFQjUos/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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