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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a8c369916f2a780d6e7372730b363e45a48b9af5f3992c8b8e6b21946b67fc' 
  AND token = 'kW5ViDp0vbmuir6tzt/8r3DZsE91qBvc47ZEAf8wzGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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