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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0515ec5a7bcfb3bf450089dc686a470b70613ca971cb247598c54ae40daf8075' 
  AND token = '+feW2Xig+syYpMMHWdUSuaI6nOR1zrkePvEfMY03lg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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