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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4ce98e88059b79403a10bad4bf966c997a97cc1579fd2a902c6cc0ef80d937' 
  AND token = '4nEtcXgp4MZR75itQVxSXKUnt/kwPfSKhaWf5nZtzzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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