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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1f2dab0bf251bfa747cd4c573c5e22b5194e4893f0e89a1fb5ffd391d9c593' 
  AND token = '8o8+RgFb+Od05W0Rss8HUdd0xWYOsWnR1rzbYcr8prs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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