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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa517fa7dde6869062d527d58408fb998d926f9369b4b776475b09f915e4a23' 
  AND token = 'PtVXIT6v14N8kXV581ExMED7MaSUMQN4ZTcOgOdV4hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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