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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ca5da9b025b045604b0b7094a21264839335e43b2e934a81962d7e74b74d79' 
  AND token = 'UgiAWaIJN3D/9J4DrSA9XnEchikSnrgxToxdjlwPOJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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