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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7204eba19e3b20fa6e6a4963ea7cda74330ac328d269f54a6873a646c60912' 
  AND token = 'ewplzwYd+BYRujhV3A9kDX7wr/rr28ukGES87P2tj20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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