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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b560fbb722d4b9a332a2f4688e9a622e2d1b9c5f834d953576b3a727cd1ca8' 
  AND token = 'QsfO022cJnh3pw71U/px98FnWUsU+UWCK5pENn7C7uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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