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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7011c12e22054cd1714019216c21e86284684f1a19a28985e7f9af28f3e4a99' 
  AND token = 'qstOa9b+HC7KfvY211ceT3OaNgU/QiqaFSQty4R6f0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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