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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4873dfca424d327be5996e19f0855c041e2fc7afb6668751d056fe9206e653c8' 
  AND token = '8BckJ7R3My8Pf9jAd/W/FgkHrs8b5A6/eYzvxtrqB6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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