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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b2dfe827e235de9573013963559ea58df17c5e2a8e8951c5245b0c70b8eee1e' 
  AND token = '6JiK6qrFMjoeEkI0uPYkY0gpvkqhQZ8ssDquqaQoIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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