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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed759f3c65bc7bd92abf4e65c8dab9499663d14410b6ee56411d2dcaaea97c9d' 
  AND token = '85/wqtsGKO5PR84VL+dWeFehSGQtMoSk8Cyb2JsAUEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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