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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc817dccb434b676822e899ca4184419f30b9d8e019ba0340b42d27bbc6bd1f' 
  AND token = 'GWBMk0ka04qfQdT6C6y1gvQVQVauHAeI/apH7NftxRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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