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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3fa7caaf42fa6ae5b04a68c020fa4fab6e25debab71f7c70468d32f6b5b6cf' 
  AND token = 'qi9k1zCkJToO/F4248AKlx8DTNmqsh0kfpk2sCQMZZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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