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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3439a3d2112d4e8c4f12c206f550f0d16bb638bc91bc1d8f46b711c75d30bc39' 
  AND token = '9EwjoGMzaHJs++xwKwPBurQJEa5MuDTgaRxE91HS5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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