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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e79c91dc5d9a3e64b2bfe24d7f1a8fbf4edb40ffdc726d0c77cef7732c65e5' 
  AND token = '2CZa7al9B8qTaopMS1wWWeHK8PDrnP3ckBSVl8V/RWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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