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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441ef4ff88e633f7ea17ce73d3d657252dbea3431098ea07025a2f29ce698a82' 
  AND token = 'c6SyctiNl6R1ebMZXCiCeauVK2yxYHJSvdxfXf5pqrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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