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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021ecce5b1831d7c39bd876f8736e8e9f9806d6d98fbd463bef15524a4c97b83' 
  AND token = 'CkVPVem1FAREhZM/FwPopgzc9WHNIPZT2ezkFAecg18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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