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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '372077219cd93bc17866790b3ac79dfa76081f9fb57b38816a936a23f970c29d' 
  AND token = 'N9d82zVRDGhxiThPSCYrP4l97daAjkROE/wDs7KET84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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