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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7716316ffb01f8e88a28d156726983728cfb7480125c049a0a5e8bc870b31007' 
  AND token = '3rowNET2tzR08AUBQDTCjg6fPdSTjC/lg+fj2W9Zxoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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