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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7892ff743e1d73afcfac295fa20adbaf694316a002c054f3884d1383b4816ff' 
  AND token = '3Z0dN+OkfkkA2R/WePW6r2Ueva2h+iXHL4a23D3dHcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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