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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3506f20a460f57f02205bd2ab9716dbd25bbfbcd65dfd014c2fab0d6b0eea5fe' 
  AND token = '7MbDaOxX7+0a9D89Y3wtAYALuQlWOr3TLx+Hk324lWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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