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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0f641ceed0996ffa80c842beb56f667268782f95812059469375cf8f4b6ea3' 
  AND token = 'QQLYBc4NvIO846p9LtRDvGssZ8SFzfxeWmtz/rMWUWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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