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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bf887aa5fbfdb163144c8cd1d4a66bf1b16ac7de5e44b612552ab9f8ecb165' 
  AND token = '/RQGvasxCkXuoRTI6c5yoTriXYmiDQugqEqX9m3Amvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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