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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24b3d300021d3a2e3496ecd4d9a98dbd032b69330d2449df3257ab8254318cd' 
  AND token = '63OkQLJBI7HO/McZZc4ys4Innl6RVPKAhEZkkrEyTH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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