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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296c23961f484c87d5ed0dc26e032b1a057f44d412a9e88864f09557fc706be5' 
  AND token = 'FWwbOnmecax15O2ckSma6q5KPJyUjktbAzni5h/j2xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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