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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f8a39645572561ebe2a17567412e9b1d9c97424c2c4a48b42273ae3f23bfdc' 
  AND token = 'xEu4rWSyRL96qBrxNft3gE6ZwknK6VaSoavyHQO2ik0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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