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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1981c9a421946ef0386491f0b23e65d915d798a43dc9e3b8089260989203ff63' 
  AND token = 'Uqeecra6j56gnTcVj3xTy4dy5LgbU7Pn7KE748loH4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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