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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6062502b5633d9c642d29e845fd45600089a0d4d71e9ae78870f6d03e56e4c3f' 
  AND token = 'vlE1iFv1wuiiRETFbNjhjiap4Ume1vzBj8n0wt10ZjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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