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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd8e35d9448d121ef1494eb66ff4919833abd3f93b6c61bae0feac81712b831' 
  AND token = 'I8lW0NEHCX80d929UVDPEzrRh4AbyRwJnu8jgpnwA5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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