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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34aad91c4a0ee0997c0fe0876178b3bbff7a1e510ab5f0ee9bf4a87c8a5f7b' 
  AND token = 'eEaWRFfE6kKKfPj/eSVg5V38RHIjM+NFLt5HCN2kOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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