SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f0d2473bafcb2afd5ad02c5e6c16bdda664c696f246f34555610a6d688247e' 
  AND token = 'NjNJYYgV0x9u6/938JpCv3+SbgaPsQ7PyZq4LXHQ0GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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