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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432b7811ccc5a13340a65314b637953b5ab516e1e3d02393b34e2f1fd7930fbf' 
  AND token = '+sfpuFCNNNTMHbSp24JMaD5KPv5XF5cBtkBi44t54M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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