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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cf1b181cef0302d5dec4f30f88b4a40e5beea4966ae7e8eda75cf307321cc2' 
  AND token = 'VKu7znZQgK6ACTb/k0iVNVTjqTq8uWFQgkMtxonA/bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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