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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625bc1ac3de89a3c1323e9f2a233276b28277793b39b0f3e53e044934d7593d5' 
  AND token = 'gXfx/svI5Da348MdiObd+i0Wl8lwvjGuB9GSv8Wq0WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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