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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c24faeab2899593938f673c57c15b057f94fa727c03428fba6c6939abedaf4c6' 
  AND token = 'b2u8MpJ9SnG85zyML5w59/xVG4FQg66QuHbCliJ2q9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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