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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dcf766d044f3985204c06c607815cde93aed2583f6ef73a2286b83cb83420f' 
  AND token = 'UD1AfYyMGSSndrRIYT2sNGy0fbicznO+elBxJUpaW/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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