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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdf88deefbaa02cb12d94d8747590fa08899716a22bd927202fa08e39aa9944' 
  AND token = 'wSt+T5wm4GlcndwaQZcyEcRpy0WWqjv8L8GnV7tHhF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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