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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb2effb0c001cde0ba8b4c1d91c85afc7bbe51e5fec7faac3284861c1a64528' 
  AND token = '72zrlD17let2PU+vKUKWZYZVN2a3/rzGuZJ6H10PAD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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